/*
 * Copyright (c) 2015. For Intelligent Group.
 */

package com.intelligent.ispc.common.utils;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.lang3.StringEscapeUtils;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

/**
 * More different tools for encoding.
 * 1.Commons-Codec: hex/base64 编码
 * 2.base62
 * 3.Commons-Lang: xml/html escape
 * 4.JDK: URLEncoder
 * <p>
 * Created by Peter.Li on 2015/10/9.
 */
public class Encodes {

    private static final String DEFAULT_URL_ENCODING = "UTF-8";
    private static final char[] BASE62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".toCharArray();

    /**
     * Hex encoding.
     */
    public static String encodeHex(byte[] input) {
        return Hex.encodeHexString(input);
    }

    /**
     * Hex decoding.
     */
    public static byte[] decodeHex(String input) {
        try {
            return Hex.decodeHex(input.toCharArray());
        } catch (DecoderException e) {
            throw ApplicationException.unchecked(e);
        }
    }

    /**
     * Base64 encoding.
     */
    public static String encodeBase64(byte[] input) {
        return Base64.encodeBase64String(input);
    }

    /**
     * Base64 encoding, URL Safe (translate the illegal characters '+' and '/' to '-' and '_', see RFC3548).
     */
    public static String encodeUrlSafeBase64(byte[] input) {
        return Base64.encodeBase64URLSafeString(input);
    }

    /**
     * Base64 decoding.
     */
    public static byte[] decodeBase64(String input) {
        return Base64.decodeBase64(input);
    }

    /**
     * Base62 encoding。
     */
    public static String encodeBase62(byte[] input) {
        char[] chars = new char[input.length];
        for (int i = 0; i < input.length; i++) {
            chars[i] = BASE62[(input[i] & 0xFF) % BASE62.length];
        }
        return new String(chars);
    }

    /**
     * Html escape.
     */
    public static String escapeHtml(String html) {
        return StringEscapeUtils.escapeHtml4(html);
    }

    /**
     * Html un escape.
     */
    public static String unescapeHtml(String htmlEscaped) {
        return StringEscapeUtils.unescapeHtml4(htmlEscaped);
    }

    /**
     * Xml escape.
     */
    public static String escapeXml(String xml) {
        return StringEscapeUtils.escapeXml11(xml);
    }

    /**
     * Xml un escape.
     */
    public static String unescapeXml(String xmlEscaped) {
        return StringEscapeUtils.unescapeXml(xmlEscaped);
    }

    /**
     * URL encoding, default is UTF-8.
     */
    public static String urlEncode(String part) {
        try {
            return URLEncoder.encode(part, DEFAULT_URL_ENCODING);
        } catch (UnsupportedEncodingException e) {
            throw ApplicationException.unchecked(e);
        }
    }

    /**
     * URL decoding, default is UTF-8.
     */
    public static String urlDecode(String part) {

        try {
            return URLDecoder.decode(part, DEFAULT_URL_ENCODING);
        } catch (UnsupportedEncodingException e) {
            throw ApplicationException.unchecked(e);
        }
    }
}
